The time between the onset of COVID-19 and the death

The main pandemic this year around the world can be regarded as COVID-19, an extremely serious virus that negatively affect many people. In order to better deal with the virus to save more lives, it is necessary to discover the relationship between the cases and deaths of COVID-19 to promote the plan to prevent and treat people in a desirable time. In this work, the research mainly focusses on the length of the apparent lag between cases and deaths to help governments and organizations in prevention and treatment. As the state with most cases and deaths, the study of the United States is deemed to be typical for the observation whole world. This work focuses on 4 representative states in the America (Michigan, Arizona, Hawaii, Connecticut) to conclude that the time between the onsite of COVID-19 to death is about one to two months through multiple data analysis techniques including linear regression model, time lag analysis to assist the formulation of the plan in prevention and treatment.